Background. Aberrations such as fusion, reduction, displacement of scales, division to segments, appearance of additional small scutes and furrows are sometimes observed in reptile pholidosis. During the study same located aberrations were found in different individuals and even different species so a comparative analysis was carried out.
Materials and methods. This paper considers aberrations of pholidosis of six species of reptiles dwelling in the Republic of Tatarstan: the sand lizard and the common lizard, the grass snake, the smooth snake, the adder and the eastern mead-ow viper.
Results. Vipers and lizards are characterized by greatest variety of aberrations. The highest values of quantitative indexes of aberrations were observed in vipers. Changes more often affect the 2nd and 3rd labial scales, 1st and 4th supraocular scales in lizards and the 5th and 6th labial scales in colubrid snakes. Aberrations of ventral scales are usually located at the end of the body in all studied species of liz-ards and snakes. Aberrations of subcaudal scutes are commonly located at the be-ginning of the tail in all studied species of snakes.
Conclusions. Generally it can be noted that vipers are characterized by large number and variety of aberrations of pholidosis. Species with similar pholidosis demonstrate resemblance in configuration and topography of aberrations. General regularities in aberrations topography were observed: aberrations of ventral scales are usually located at the end of the body; aberrations of subcaudal scutes are commonly located at the beginning of the tail.
reptiles, morphology, pholidosis, aberrations, deviations, Coronella austriaca, Lacerta agilis, Natrix natrix, Vipera berus, Vipera renardi bashkirovi, Zootoca vivipara
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